Any experiance of fault detailed below?

duncanb
0

Asked by duncanb Apr 19, 2013 at 10:47 AM about the 2005 Mercedes-Benz C-Class

Question type: Maintenance & Repair

The battery/Alternator warning light appears intermittantly despite the battery being new and a volt meter reding shows alterntor is charging.Model is c200 cdi

9 Answers

tenspeed
52,345

It could be the alternator is failing or there is a loose wire somewhere. Plug in a cigarette lighter voltage gauge to check it. -- http://www.ebay.com/itm/12V-24V-Digital-LED-Auto-Car-TRUCK- SYSTEM-Lighter-Voltmeter-Gauge-Voltage-Meter-/190819892334? pt=Motors_Car_Truck_Parts_Accessories&hash=item2c6dc07c6e&vx p=mtr

2 out of 2 people think this is helpful.
judge_roy
Not Active

ground wire off the battery to the chassis has been comprimized through corrosion, take the black wire off polish it clean, need to pull 300 CCA's through there, also the connection to the motor block and chassis. Be sure they've got what's comin' to 'em~

1 out of 1 people think this is helpful.
John Sturman
1,225

the charging circut is controlled from the ecu on the merc as it shares the same principle as the chrysler ecus and the fault itself is where the chip for the circut is breaking down had one similar put a rectifyer circut in line and bypassed the ecu to charge the battery and pulled the bulb behind the dash

2 out of 2 people think this is helpful.
bobkat
3,315

Just got my 2007 MB out of the shop yesterday. Similar problem. It took several days of testing to find problem. All test of battery and alternator were good. The shop manager decided to let the car run in idle for well over an hour - then they discovered that the regulator started to steadily reduce its output to the point where it was no longer charging the battery. Replaced the regulator and now life is good.

3 out of 3 people think this is helpful.
judge_roy
Not Active

a 2007 Still has a voltage regulator? thought they stopped using them altogether 'round 1980, what do I know? I know that you can get a one wire alternator with regulator built-in and throw the regulator that you've got into the bin, and don't worry the one-wire job has it down~ wondering now if there is a one-wire alternator replacement to fit your buggy?

bobkat
3,315

The repair ticket from MB says Voltage Regulator in Alternator. The part was $163.40 plus labor.

judge_roy
Not Active

they should at least give you the old one if they're rookin' ya' like that~

judge_roy
Not Active

bobkat, am giving this guru business up, I've got an oil painting career to spend time on...it's been nice offering my help to you, one last thing on the one-wire alternator, apparently MBZ has two wire jobs- http://www.benzworld.org/forums/unimog/1505478-one-wire-alternator- conversion.html so long bobkat.....always a fan!~

1 out of 1 people think this is helpful.
bobkat
3,315

Judge Roy - its always great to hear from you. Have a good day.

Your Answer

Add photo

Related Questions

C-Class
Looking for a Used C-Class in your area?
CarGurus has 21,372 nationwide C-Class listings starting at $1,990.
ZIP:

Search Mercedes-Benz C-Class Questions

Mercedes-Benz C-Class Experts

#1 Lorne Grandison
Lorne Grandison
Reputation 1,650
#2 Tom Demyan
Tom Demyan
Reputation 450
#3 PPC123
PPC123
Reputation 430
View All

Related Models For Sale

Used Mercedes-Benz E-Class"
820 Great Deals out of 16,396 listings starting at $1,595
Used BMW 3 Series"
1,473 Great Deals out of 35,964 listings starting at $1,000
Used Mercedes-Benz S-Class"
268 Great Deals out of 7,091 listings starting at $2,500
Used BMW 5 Series"
635 Great Deals out of 15,443 listings starting at $1,500
Used Mercedes-Benz CL-Class"
38 Great Deals out of 680 listings starting at $5,999
Used Mercedes-Benz CLS-Class"
84 Great Deals out of 2,088 listings starting at $12,195
Used Audi A4"
345 Great Deals out of 9,846 listings starting at $1,400
Used Mercedes-Benz M-Class"
310 Great Deals out of 8,515 listings starting at $2,495
Used Mercedes-Benz CLK-Class"
102 Great Deals out of 1,577 listings starting at $2,600
Used BMW M3"
99 Great Deals out of 1,400 listings starting at $4,991
Used Mercedes-Benz SL-Class"
91 Great Deals out of 2,338 listings starting at $3,990
Used Mercedes-Benz SLK-Class"
81 Great Deals out of 1,558 listings starting at $2,999

Used Cars For Sale

2014 Mercedes-Benz C-Class For Sale
65 Great Deals out of 3,576 listings starting at $24,999
2013 Mercedes-Benz C-Class For Sale
129 Great Deals out of 1,730 listings starting at $20,900
2012 Mercedes-Benz C-Class For Sale
201 Great Deals out of 2,795 listings starting at $18,999
2011 Mercedes-Benz C-Class For Sale
119 Great Deals out of 1,578 listings starting at $16,995